Mercury Vapor Lamp Uv Spectrum

Mercury vapor conducts electricity completing the circuit.

Mercury vapor lamp uv spectrum.

Pulsed xenon lamps emit uv light across the entire uv spectrum with a peak emission near 230 nm. Low pressure mercury vapor lamps are a highly efficient source of uv light particularly short wavelength uv light 254nm and 185nm. As the arc temperature rises mercury in the lamp converts to a gaseous vapor state. Often called germicidal or ozone absorption lamps they are very stable light sources.

Current is limited from the power source to protect the lamp and supply wiring. Line spectrum of mercury vapor. The blue green tint of mercury vapor lamps is caused by the strong violet and green lines. In low pressure mercury vapor lamps only the lines at 184 nm and 254 nm are present.

Mercury based lamps operating at low vapor pressure emit uv light at the 253 7 nm line. The dominant emission 90 from these lamps is uv c energy. When the mixture is energized excited it creates a glowing plasma of electrons that pass through the mercury vapor. These lamps are usually low pressure mercury vapor lamps.

Uv spectrum in medium pressure mercury lamps a plasma that emits uv light is generated by applying electrical voltage. 125w reptile heat lamp bulb mixjoy high intensity self ballasted mercury vapor light bulb uva uvb full spectrum sun light for reptile and amphibian use 4 2 out of 5 stars 31 21 99 21. High pressure mercury lamps installed at most fluorescence microscopes are not suitable because they do not emit the short wavelengths needed for this lithography. Fused silica is used in the manufacturing to keep the 184 nm light from being absorbed.

The distribution of energy over the wavelength ranges is depicted on the left. As they strike mercury atoms a mercury electron is liberated at a frequency representative of mercury s spectral line which is 253 7nm. Ultraviolet light emitting diode uv c led lamps emit uv light at selectable wavelengths between 255 and 280 nm. It is important to use a lamp that emits uvc also termed far uv deep uv or vacuum ultraviolet vuv.

Lamp output in the uv range depends on the amount of mercury and vapor pressure of mercury in the lamp. The usual means of generating uv c for disinfection is most typically with a mercury vapor lamp that produces light through use of an electric arc through vaporized mercury. Unlike most other uv sources the medium pressure lamp mpl has a polychromatic spectral distribution from 190 nm up to the infrared spectrum.